| Primary address | 575 Underhill Boulevard, Syosset |
| Zip code | 11791 |
| County | Nassau |
| Town/City | Oyster Bay |
| Village (swiss code) | None (unincorporated town) |
| Parcel ID | 15-169-20 |
View detailed information on past sales, title documents and property taxes, including the assessed market value, in their dedicated tabs.
| Sale date | 12/01/2000 |
| Sale price | $21,471,255 |
| Arm's length | Register |
| Building sqft | 228,894 |
| Building class | Storage, Warehouse and Distribution Facilities (440.04) |
| Land | Primary site |
| Topography | Level |
| Acreage | 16.597 |
| Buildings on lot | 1 |
| Year built | 1956 |
| Stories | 1 |
| Zoning district | Register (See more on map) |
| Capitalization rate | Register |
| Air conditioning | Central |
| Street | Paved |
| Traffic | Medium |
| Area type | Commercial/Industrial park |
| School district | Locust Grove |
| Conversion feasibility index |
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View more neighborhood information such as transportation, nearby schools and risk designations in the dedicated tab.
| Square footage | Structure | Grade | Year built | Stories |
|---|---|---|---|---|
| 228,894 | Flex indtrl/warehouse | B+ | 1956 | 1 |
| Floors | Square footage | Use | Construction | Condition | Exterior wall | Heating | Air conditioning | Plumbing |
|---|---|---|---|---|---|---|---|---|
| 01-01 | 36,605 | Flex building | Register | Register | Register | Register | Central | Register |
| 01-01 | 24,038 | Flex building | Register | Register | Register | Register | Central | Register |
| 01-01 | 61,138 | Flex building | Register | Register | Register | Register | Central | Register |
| 01-01 | 75,692 | Flex building | Register | Register | Register | Register | Central | Register |
| 02-02 | 31,421 | Offices 20,001 - 50K sf | Register | Register | Register | Register | Central | Register |
Find the size and usage for each floor in the building, plus corresponding details on construction type, physical condition, heating, and plumbing.
Check out a breakdown by type of rentable square feet and the rent charged for each, including detailed info on expenses, gross/net income, income and expense rate.
Property reports include comprehensive occupancy, improvement and development information (where available).
Create a free account to access valuable data points such as:
This Storage, Warehouse and Distribution Facilities (440.04) located at 575 Underhill Boulevard, Syosset, NY 11791 has a total of 228,894 square feet.
What is the year built & the current market value of 575 Underhill Boulevard, Syosset, NY 11791?575 Underhill Boulevard, Syosset, NY 11791 was built in 1956 and has a current tax assessor's market value of $25,364,900.
View detailed property contacts like owners, building management, representatives from permits and tenants with a free account.
| Listing type | For Lease |
|---|---|
| Listing date | 12/23/2016 |
| Last updated | 04/03/2026 |
| Lot size | 16.6 Acre |
| Suite name | Space type | Lease rate | Available space | Brokers |
|---|---|---|---|---|
| #216 | R&D - Office | $26/Sqft/Year | 3,900 | David Hercman Daniel Ginsberg |
| #E | R&D - Office | $26/Sqft/Year | 2,300 | David Hercman Daniel Ginsberg |
Create a free account to view the complete sales history for 575 Underhill Boulevard, Syosset, including title documents, transfer conditions, mortgages and liens.
To view the complete history of deeds, mortgages, assignments of leases and rents, and more, sign up for free. Available data goes back to 1966.
R: Recorded date
D: Document date
Access detailed property tax data for 575 Underhill Boulevard, Syosset, NY 11791. Tax information included: property tax, market value and assessed value, exemptions, abatements, and assessment history.
| Tax year | 2026 |
| Property tax | $0 |
| Tax class | Register |
| Market value | $25,364,900 |
| Assessed value | $253,649 |
| Transitional assessed value | Register |
Here's the assessment & property tax history for 575 Underhill Boulevard, Syosset, including the evolution of the total tax rate and corresponding property tax.
| Year | Market value | Assessment value | Total tax rate | Property tax | Year over year change |
|---|---|---|---|---|---|
| 2026 | $25,364,900 | $253,649 | n/a | ||
| 2025 | $28,032,700 | $280,327 | n/a | ||
| 2024 | $28,032,740 | $280,327 | 644.549 | $1,678,451 | n/a |
| 2023 | $28,032,700 | $280,327 | n/a | ||
| 2022 | $28,032,700 | $280,327 | n/a |
The complete history of permits filed for 575 Underhill Boulevard, Syosset, including new construction or demolition permits, plus any work pertaining to plumbing, heating and sprinkler systems is available with a free account. Available data goes back to 1990.
| Total population | 25,520 |
| Median age | 43.2 |
| Average household income | $276,174 |
| Family households | 83.9% |
| Occupied housing units | 8,113 |
| Owner occupied units | 93.5% |
| Average number of people per household | 3.11 |
| Median year structure built | 1959 |
| Median value for units with a mortgage | $968,800 |
| Median value for units without a mortgage | $878,600 |
Create a free account to unlock extended information for 575 Underhill Boulevard, Syosset, including whether it's located in FEMA flood zones, floodways or special flood hazard areas, as well as the Coastal barriers resources system area (COBRA).
| FEMA flood zone(s) | X (See more on map) |
Access the detailed traffic volume map for 575 Underhill Boulevard, Syosset to see estimated average daily traffic on streets surrounding the property as well as the types of properties in its vicinity.
| View daily traffic map |
Here are the neighbors for 575 Underhill Boulevard, Syosset.
| Address | Square feet | Purchase date | Purchase price |
|---|---|---|---|
| 8 Dorothy St, Syosset | 1,852 | 07/31/2008 | $619,250 |
| 10 Jean Pl, Syosset | 1,593 | 09/15/2020 | $770,000 |
| 140 Eileen Way, Syosset | 42,548 | 10/14/2015 | |
| 345 Underhill Blvd, Syosset | 274,779 | 09/27/2006 | $31,900,000 |
| 2 Dorothy St, Syosset | 2,203 | 09/01/2017 | $765,000 |
| 485 Underhill Blvd, Syosset | 35,889 | 08/22/2006 | |
| 425 Underhill Blvd, Syosset | 80,100 | 02/19/2019 | $8,600,000 |
| 325 Underhill Blvd, Syosset | 41,800 | 06/12/2008 | $5,973,000 |
| 12 Jean Pl, Syosset | 2,228 | 01/11/2021 | $869,000 |
| 26 Cedar St, Syosset | 1,688 | 08/24/2005 | $599,000 |
| 6 Dorothy St, Syosset | 2,115 | ||
| 14 Jean Pl, Syosset | 2,115 | 12/05/2024 | $850,000 |
| 475 Underhill Blvd, Syosset | 76,280 | 03/20/2026 | $15,675,000 |
| 313 Underhill Blvd, Syosset | 58,400 | 09/27/2006 | $17,694,245 |
| 150 Eileen Way, Syosset | 29,165 | 12/28/2023 | $6,500,000 |
| 225 Underhill Blvd, Syosset | 103,136 | ||
| 24 Cedar St, Syosset | 1,688 | 06/13/2003 | $525,000 |
| 4 Dorothy St, Syosset | 2,596 | 09/05/2019 | $695,000 |
| 28 Cedar St, Syosset | 2,923 | 03/01/2007 | $463,500 |
| 2 Lesley Dr, Syosset | 2,090 | 07/01/2003 | $569,000 |